Double-machine redundant tolerant system and redundant switching method thereof

Abstract

The invention discloses a dual-computer redundancy fault-tolerant system and the redundancy switching method. The system comprises an A computer, a B computer, redundancy switch control units in the A and B computers transmit respective switch signals to a redundancy switch selecting unit, and the final control signal generated by the redundancy switch selecting unit is transmitted to a controlled unit. The redundancy switch control unit includes an arbitrary switch unit, a heartbeat receiving unit, a power on-off unit and a monitoring unit. The method comprises the following steps: the two computers are powered up, a master computer and a slavery computer are decided by power up strategy; the states of the two computers are judged; if the two computers have no fault, the task segment of a system is judged: if the system is in normal task segment, a working computer powers up a backup computer, and executes cold backup strategy; if the system is in key task segment, the working computer powers down the backup computer, and executes hot backup strategy; if a single computer has fault which is restorable, the fault is restored, or else, the system enters into single computer state. The system has simple structure and reliable signal transmission; the method is easy to control, the system fault rate is greatly reduced, thus having good fault-tolerant effect.

Description

technical field [0001] The invention relates to a redundant fault-tolerant system and a switching method thereof, in particular to a dual-machine redundant fault-tolerant system and a method for redundantly switching two machines in the dual-machine redundant fault-tolerant system. Background technique [0002] For a computer-centric system, it is important that the system continue to work if one of the system's computers fails. In order to solve this problem, the measure commonly taken at present is to design a redundant system for the system to support fault-tolerant operation. Considering factors such as cost and use area, under normal circumstances, the system is designed with dynamic dual-mode redundancy. The dynamic dual-mode redundant system includes a working machine and a backup machine, and their functions can be interchanged. In this dual-machine redundant design, it is necessary to determine a mechanism so that in each stage there is a controller as the primary...

AI Technical Summary

Problems solved by technology

This method prevents the hidden dangers caused by the failure of the switching components, but the direct connection of the status signal lines will lead to more redundant signals and the circuit connection is very complicated

In addition, traditional fault-tolerant redundant system design pays little attention to fault detection

However, the fault detection signal is an important basis for whether to switch. If a problem occurs in the fault detection, the system may be in a deadlock or "ping-pong switching", so the fault will be difficult to judge

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